have been scheduled for 2012 November 1 22:52:28 UT through November 2 07:09:06 UT.

Extensive coverage in the 48 hours preceding the HST window is crucial, as the HST scheduling team will make a go/no-go decision in the 24 hours preceding the observations. They will need to know whether the system is in quiescence, as if it is too bright it will damage the instrumentation and the observations will be cancelled.

Positive observations, if at all possible, are preferred to fainter-thans so as to know the actual magnitude of the system. During quiescence 1RXS J023238.8-371812 is around magnitude V=18.8 (magnitude 11 in outburst).

Coordinates: R.A. 02 32 37.96 Dec. -37 17 54.9 (2000.0)

As instructed in Alert Notice 471, for CCD observers, simultaneous photometry [shortly before, during, and after the HST observations] would be ideal. B filter would be best for a light curve, although for the magnitude estimates, a V measurement would be best. An uninterrupted light curve would be better than cycling between filters. This target is likely too faint for positive visual observations, but if possible they are welcome, as are visual fainter-than observations fainter than magnitude 15.0.

If you have been observing this star, thank you from us and from the astronomers - please continue! If you can add this star to your program through early November, please do, and thank you. Your observations will be crucial to the success of these observations and are greatly appreciated. Many thanks!

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.

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